Ncert Exercises & Solutions

Which of the following reagents can be used to oxidize primary alcohols to aldehydes?

I. ${CrO}_{3}$ in anhydrous medium

II. ${KMnO}_{4}$ in acidic medium

III. Pyridinium chlorochromate

IV. Heat in the presence of Cu at 573K

Choose the correct option
1. (I, II, III)
2. (II, III, IV)
3. (I, III, IV)
4. (I, II, IV)

${CrO}_{3}$ in anhydrous medium is used to oxidise primary alcohols to aldehydes.

${RCH}_{2} OH \overset{{CrO}_{3} (anhydrous)}{\to} RCHO$

Acidic ${KMnO}_{4}$ is a very strong oxidising agent. It oxidizes primary alcohol into a carboxylic acid.
${RCH}_{2} OH \overset{{KMnO}_{4}}{\to} RCOOH$

Pyridinium chlorochromate $C_{6} H_{5} \overset{+}{N} {HClCrO}_{3}^{-}$ is a very good reagent for the oxidation of primary alcohols to aldehydes.

${RCH}_{2} OH \overset{PCC}{\to} RCHO$
When the vapors of primary alcohols are passed over heated copper at 573K, dehydrogenation takes place and an aldehyde is formed.

${RCH}_{2} OH \to_{573 K}^{Cu} RCHO$

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